Tip: If you give a Muncher tile custom graphics, it will still act like a coin when a silver P-switch is active, whether it looks like a coin or not. So make sure to use ExAnimation if there's a silver P-switch in the area.
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SMW Hack resets Itself randomly when playing levels
all the blocks are 1 life which makes the rom slow down I think too much sprite makes you try to delete the 1 life block by a 1 piece block.
if it still doesn't work you may have to use the restore point or at worst copy and paste the levels and overworld to a clean rom.
sorry my English is bad